{ "compilerOptions": { // project options "lib": [ "ESNext", "dom" ], // specifies which default set of type definitions to use ("DOM", "ES6", etc) "outDir": "build", // .js (as well as .d.ts, .js.map, etc.) files will be emitted into this directory., "removeComments": true, // Strips all comments from TypeScript files when converting into JavaScript- you rarely read compiled code so this saves space "target": "ES6", // Target environment. Most modern browsers support ES6, but you may want to set it to newer or older. (defaults to ES3) "module": "es2015", // Module resolution "baseUrl": "./", // Lets you set a base directory to resolve non-absolute module names. "esModuleInterop": true, // fixes some issues TS originally had with the ES6 spec where TypeScript treats CommonJS/AMD/UMD modules similar to ES6 module "moduleResolution": "node", // Pretty much always node for modern JS. Other option is "classic" "paths": {}, // A series of entries which re-map imports to lookup locations relative to the baseUrl // Source Map "sourceMap": true, // enables the use of source maps for debuggers and error reporting etc "sourceRoot": "/", // Specify the location where a debugger should locate TypeScript files instead of relative source locations. // Strict Checks "alwaysStrict": true, // Ensures that your files are parsed in the ECMAScript strict mode, and emit “use strict” for each source file. "allowUnreachableCode": false, // pick up dead code paths "noImplicitAny": true, // In some cases where no type annotations are present, TypeScript will fall back to a type of any for a variable when it cannot infer the type. "strictNullChecks": true, // When strictNullChecks is true, null and undefined have their own distinct types and you’ll get a type error if you try to use them where a concrete value is expected. // Linter Checks "noImplicitReturns": true, "noUncheckedIndexedAccess": true, // accessing index must always check for undefined "noUnusedLocals": true, // Report errors on unused local variables. "noUnusedParameters": true // Report errors on unused parameters in functions }, "include": ["./**/*.ts"], "exclude": [ "src/**/*.test.ts", "node_modules/**/*" ], }